Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1551cdf949e4b32…

MALICIOUS

PDF

88.0 KB Created: 2021-07-25 02:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20c47e2f51c58782ddf3aeab2ae80176 SHA-1: 89053f572582f151bc4839f0587a33136a5fa34f SHA-256: c1551cdf949e4b32948184a97d1617a57b691f9389f36c207835450d9bc63062
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content or for SEO manipulation. No scripts were extracted, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://enricobarraco.com/files/xukuvegejejorajufidodaz.pdf In PDF document text
    • http://sgrappresentanze.eu/userfiles/files/gobog.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fd9cce59---99222328758.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/85dc22322f1592b401cfd35816651fcb/kinedixiveriboram.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/0bdd0d9fe9a990a2ad45c54113af4795/22238754676.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/69050101605f07f68e85bbd17a97b2e8/nekemur.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/zedovemimowufuwufewobize.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ee82bd48f---31541490717.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/sajat.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/da28e2c912bb0479991e44bec2143b65/88550304559.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee119f192---82724564204.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e707de8c82aa1040939b7c4fcf0917ae/14354068929.pdfIn PDF document text
    • https://nic-n-nate.com/files/files/16978903953.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/buvapomerumovapajipax.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/sewefutifezefubezukikix.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/mokegileva.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/39286308737.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/zavodiwimuporubaw.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/de791721da2630daba27780d9b81da2c/70021391530.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/dorileziruromizisat.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5384b0ae8580c8bd388f1f1a696b0372/49818940642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=queen+size+bed+ikea+hyderabadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 16828 bytes
SHA-256: 2cb72cd7a74773a16bd9c8518d5179e723efe6d1f97b15de5e22d3fb8a22b2b8
font_02_sfnt_off000138c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C2 10648 bytes
SHA-256: 37f8c6762dfe19ac5f7594d4dd35b383e84462a3ce6757f547d9f826db2bacb9

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